Vertex color messed up? How to write to specific channel?

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1

How its look in blender. Pure 1.0.0, 0.1.0 and 0.0.1 values.

изображение_2022-01-21_034403
изображение_2022-01-21_0344031442×1270 67.7 KB

Here’s a result of visualizing vertex color masked to specific channel inside UE4.
R, G and B. The bottom one are RBG simultaneously.

изображение_2022-01-21_034156
изображение_2022-01-21_0341561721×1116 135 KB

Its a complited mess. How to properly write vertex colors in blender? Im missed something?

2

Just fill you vertex color with 0.0.0 first. When use R G or B to paint whatewer you want you fruitcake.